Article
Optics
Yang Zhao, Xiao-Feng Shi
Summary: Topological nontrivial bands can be realized via Rydberg-dressed neutral atoms. By studying a two-dimensional hard-core boson model on a honeycomb array, it is found that a fractional Chern insulator phase with Chern number C = 1/2 can exist in the system, even in the presence of weak many-body interactions.
Article
Materials Science, Multidisciplinary
Lukas Schamriss, Lea Lenke, Matthias Muehlhauser, Kai Phillip Schmidt
Summary: In this study, we investigate the quantum phase diagram of the K-layer Ising toric code coupled by Ising interactions. The system exhibits different topological orders depending on the strength of the Ising interactions. Through high-order series expansions, we determine the energy gaps and provide evidence for the existence of a quantum critical point in the ground-state phase diagram.
Article
Optics
Yu Yao, Henning Schloemer, Zhengzhi Ma, Lorenzo Campos Venuti, Stephan Haas
Summary: This study explores topological protection mechanisms in dissipative quantum systems in the presence of quenched disorder to extend the coherence time of a fiducial qubit. It is found that under certain symmetries, a winding number can be defined and evaluated even in the presence of disorder, allowing for the construction of topological phase diagrams. In the presence of competing disorder parameters, interesting reentrance phenomena of topologically nontrivial sectors are observed, where increasing disorder drastically increases the coherence time of the fiducial qubit in certain parameter regions.
Article
Materials Science, Multidisciplinary
Jing-Yun Fang, Ning-Xuan Yang, Qing Yan, Ai-Min Guo, Qing-Feng Sun
Summary: The study reveals the presence of dissipation in topological systems, where thermal dissipation can occur in the quantum Hall regime in graphene. Dissipation processes are accompanied by the evolution of energy distribution from nonequilibrium to equilibrium.
Article
Computer Science, Hardware & Architecture
Shin-Guang Chen, Yi-Kuei Lin
Summary: The article proposes an improved merge search method for evaluating the reliability of network systems, and demonstrates its efficiency through benchmark comparisons with well-known algorithms. The results show that the proposed algorithm can save as much as 10 times in computation time compared to existing methods in the literature.
IEEE TRANSACTIONS ON RELIABILITY
(2022)
Article
Materials Science, Multidisciplinary
M. Kazem Negahdari, Abdollah Langari
Summary: We study the nonlinear response of the Kitaev honeycomb lattice model in a weak magnetic field using 2D coherent spectroscopy. In the nonAbelian phase, the nonlinear spectrum in the frequency domain consists of sharp signals originating from flux excitations and Majorana bound states. Different flux excitations, including 4-adjacent, 2-nonadjacent, and 4-far-separated fluxes, are clearly observed in this spectrum. In the Abelian phase, the spectrum is composed of streak signals representing the presence of itinerant Majorana fermions. However, in the deep Abelian phase with a dominant Kitaev exchange coupling, the streak signals weaken and single sharp spots resembling the dispersionless response of the conventional toric code are observed.
Article
Engineering, Electrical & Electronic
Chia-Hao Liu, Hsien-Chin Chiu, Hsiang-Chun Wang, Hsuan-Ling Kao, Chong-Rong Huang
Summary: The study shows that DJ-HEMT exhibits higher gate voltage swing in the gate region due to the dual junction, enhancing gate performance. Compared to ST-HEMT, DJ-HEMT has higher V-TH, saturation current, I-ON/I-OFF ratio, and gate swing voltage. In addition, DJ-HEMT also has lower leakage current and longer lifetime measurement.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Physics, Multidisciplinary
Yao Shen, Chi-Chun Zhou, Wu-Sheng Dai, Mi Xie
Summary: This paper introduces a group method to solve interacting many-body systems by representing the Hamiltonian as Casimir operators of unitary group, providing exact solutions. The method maps the system onto an intermediate statistical representation and discusses concepts in the Gentile representation.
Article
Optics
Ben Bartlett, Avik Dutt, Shanhui Fan
Summary: The article proposes a scalable photonic quantum computer architecture that requires minimal quantum resources to implement any quantum circuit, avoiding the need for many identical quantum emitters and allowing effective all-to-all connectivity between photonic qubits.
Article
Materials Science, Multidisciplinary
Kai-Hsin Wu, Zhi-Cheng Yang, Dmitry Green, Anders W. Sandvik, Claudio Chamon
Summary: By studying a generalization of the two-dimensional transverse-field Ising model with combined ferromagnetic and antiferromagnetic two-body interactions, exact global and local Z(2) gauge symmetries were confirmed. The topological phase was shown to exist, and the transition between the confined topological phase and the deconfined paramagnetic phase was found to be of first order. Generalizing the model by introducing a ferromagnetic XX interaction while maintaining local gauge symmetry resulted in the stability of the Z(2) topological phase and a replacement of the paramagnetic phase with a ferromagnetic phase. The topological-ferromagnetic quantum phase transition was also found to be of first order, with discussions on low-energy spinon and vison excitations of the topological phase and their avoided level crossings associated with the first-order quantum phase transitions.
Article
Materials Science, Multidisciplinary
Daijiro Takagi, Maria Teresa Mercaldo, Yukio Tanaka, Mario Cuoco
Summary: Odd-frequency Cooper pairs can serve as a good indicator for detecting multiple Majorana fermions and distinguishing different topological phases.
Article
Engineering, Electrical & Electronic
Bowen Zhang, Mengqi Wang, Wencong Su
Summary: This paper proposes a hierarchical reliability framework to evaluate the electric power system reliability from the power electronic converter level to the overall system level. Machine learning regression models are implemented to bridge the nonlinear reliability relationship between two levels. Numerical results show power converter reliability should be considered as an important factor when evaluating overall system reliability performance.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2021)
Article
Physics, Fluids & Plasmas
M. Quintana, A. Berger
Summary: In this study, we experimentally and theoretically investigate the dynamic magnetic phase diagram and its associated order parameter Q under the action of a non-antisymmetric magnetic field sequence. The introduction of time antisymmetry through the second-harmonic field component H2 affects the static bias field, and both the static bias field and the second-harmonic Fourier amplitude of the field sequence contribute to the dynamic order parameter Q. The critical point of the phase transition is shifted upon introducing a second-harmonic field component H2, demonstrating that the overall dynamic behavior of magnetic systems is driven by the total effective amplitude of the field sequence.
Article
Engineering, Electrical & Electronic
Mao Jia, Bin Hou, Ling Yang, Fuchun Jia, Xuerui Niu, Jiale Du, Qingyuan Chang, Meng Zhang, Mei Wu, Xinchuang Zhang, Hao Lu, Xiaohua Ma, Yue Hao
Summary: In this letter, an oxidation technique is applied to a normally-off p-GaN/AlGaN/GaN HEMT to improve the threshold voltage and gate reliability. The introduction of a 5 nm oxidation interlayer through oxygen plasma and low-temperature Oxygen post-annealing treatment (OPAT) of p-GaN before gate metal deposition significantly enhances the gate breakdown voltage. The results demonstrate the potential application of this technology in GaN power devices.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Physics, Fluids & Plasmas
Ishfaq Ahmad Bhat, Thudiyangal Mithun, Bishwajyoti Dey
Summary: We numerically study the formation of vortex-lattices and the dynamics of vortices in a rotating density-dependent Bose-Einstein condensate (BEC) with nonlinear rotation. By varying the strength of nonlinear rotation, we determine the critical frequencies for vortex nucleation during adiabatic and sudden external trap rotations. The nonlinear rotation affects the deformation experienced by the BEC and alters the critical frequencies for vortex nucleation. Additionally, the nonlinear rotation modifies the vortex-vortex interactions and the motion of vortices by changing the strength of the Magnus force. These nonlinear effects result in the formation of non-Abrikosov vortex-lattices and ring-vortex arrangements in density-dependent BECs.
